The Bicol ground warbler (Robsonius sorsogonensis) is a species of passerine bird in the family Locustellidae. It is endemic to the island of Luzon in the Philippines, where it is found in the southern parts of the island. Along with its other conspecifics, such as the Cordillera ground warbler and the Sierra Madre ground warbler, it is one of the most elusive birds in the country. Its natural habitat is tropical moist lowland forest. It is threatened by habitat loss.
EBird describes the bird as "A medium-sized bird of lowland and foothill forest floor, often in rocky areas. Fairly stout of body and bill, with long legs and large feet. Pale below with a grayish band across the chest and brown under the base of the tail. Note white throat, brown upperparts with two dotted white wingbars, rufous edging to the wing and tail feathers, and thin black moustache stripe. Unmistakable. Song consists of a very high-pitched “tseeeep soo tseeeep!"[2]
The Bicol ground warbler was described by the ornithologists Austin L. Rand and Dioscoro S. Rabor in 1967 and given the binomial name Napothera sorsogonensis where it was conspecific with the Cordillera ground warbler and Sierra Madre ground warbler. The specific epithet is from the name of the province Sorsogon in the Bicol Region of the Philippines where the species was first discovered.[3] It was initially believed to belong to the Old World babblers family Timaliidae and given the English name "grey-banded babbler" but this was changed to "Bicol ground warbler" when its taxonomic position was better understood.[4][5] It is now placed in the genus Robsonius that was introduced by the English ornithologist Nigel J. Collar in 2006.[6]
It is found in lowland moist dipterocarp forest in primary forest, secondary forest and forest edge up to 1,000 m. It is typically found among limestone outcrops, bamboo and mossy rocks. [7]
IUCN has assessed this bird as near threatened. The population size has not been quantified, but it is plausible that the species numbers less than 10,000 mature individuals. This species' main threat is habitat loss with wholesale clearance of forest habitats as a result of logging, agricultural conversion and mining activities occurring within the range.
It is found in two protected areas in Quezon Protected Landscape and Mount Isarog National Park; however, like most areas in the Philippines protection is lax.
Conservation actions proposed include assessing the population size and establishing a monitoring programme to quantify trends; establishing its ability to persist in degraded habitats; identifying and assessing threats; and ensuring that the Quezon Protected Landscape and Mount Isarog National Park are more effectively protected.
The Bicol ground warbler (Robsonius sorsogonensis) is a species of passerine bird in the family Locustellidae. It is endemic to the island of Luzon in the Philippines, where it is found in the southern parts of the island. Along with its other conspecifics, such as the Cordillera ground warbler and the Sierra Madre ground warbler, it is one of the most elusive birds in the country. Its natural habitat is tropical moist lowland forest. It is threatened by habitat loss.
La ratina de Rand (Robsonius sorsogonensis)[2] es una especie de ave paseriforme de la familia Locustellidae endémica del sur de la isla de Luzón, en Filipinas.
La ratina de Rand (Robsonius sorsogonensis) es una especie de ave paseriforme de la familia Locustellidae endémica del sur de la isla de Luzón, en Filipinas.
Robsonius sorsogonensis Robsonius generoko animalia da. Hegaztien barruko Pellorneidae familian sailkatua dago.
Robsonius sorsogonensis Robsonius generoko animalia da. Hegaztien barruko Pellorneidae familian sailkatua dago.
De sorsogonsluiptimalia (Robsonius sorsogonensis synoniem: Napothera rabori sorsogonensis) is een Locustellidae die alleen voorkomt op het eiland Luzon in de Filipijnen. De vogel werd in 1967 geldig beschreven.[2]
De sorsogonsluiptimalia lijkt op Rands sluiptimalia en werd vroeger als een ondersoort daarvan beschouwd.[3] De vogel is 20–22 cm lang en weegt 57–65 g. De koptekening verschilt: het voorhoofd is grijs tot olijfgroen, op de kruin meer olijfkleurig met donkere "schubben". Ook de rug van de vogel is olijfkleurig met donkere, smalle schubvormige tekening. Meer naar achter toe wordt de kleur egaal bruin en op de stuit bleker van kleur.[4]
De sorsogonsluiptimalia is aangetroffen in het zuiden van het eiland Luzon. De vogel is waargenomen in altijd groenblijvend regenbos en secundair bos, in de nabijheid van kallrotsformaties, met mos begroeide rotsen en in bamboebos. Meestal in laagland of tot hoogstens 1000 meter boven zeeniveau.[4]
De sorsogonsluiptimalia is schijnbaar zeer zeldzaam, maar dat komt mogelijk door de onopvallende leefwijze. De soort heeft echter een beperkt verspreidingsgebied dat door houtkap wordt verkleind. De grootte van de populatie is niet bekend. Om deze redenen staat deze soort sinds 2015 als gevoelig op de Rode Lijst van de IUCN.[1]
Bronnen, noten en/of referentiesDe sorsogonsluiptimalia (Robsonius sorsogonensis synoniem: Napothera rabori sorsogonensis) is een Locustellidae die alleen voorkomt op het eiland Luzon in de Filipijnen. De vogel werd in 1967 geldig beschreven.
Bikolgräsfågel[2] (Robsonius sorsogonensis) är en fågel i familjen gräsfåglar inom ordningen tättingar.[3]
Fågeln förekommer på sydöstra Luzon och Catanduanes, Filippinerna.[3] IUCN kategoriserar arten som nära hotad. Tidigare betraktades den som en underart till R. rabori och vissa gör det fortfarande.[4]
Förut sågs också arterna i släktet Robsonius okontroversiellt vara timalior och placerades ibland till och med tillsammans med andra smygtimalior i släktet Napothera. Genetiska studier visar dock förvånande nog att de är släkt med gräsfåglarna.[5]
Bikol är namnet på en halvö på ön Luzon, medan det vetenskapliga namnet sorsogonensis syftar på provinsen Sorsogón.
Wikispecies har information om Robsonius sorsogonensis.
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Bikolgräsfågel (Robsonius sorsogonensis) är en fågel i familjen gräsfåglar inom ordningen tättingar.
Robsonius sorsogonensis là một loài chim trong họ Locustellidae[1], nhưng trước đây từng xếp trong họ Pellorneidae.[2]
Loài này tách ra từ Robsonius rabori theo nghiên cứu năm 2006 của Collar[3].
Robsonius sorsogonensis là một loài chim trong họ Locustellidae, nhưng trước đây từng xếp trong họ Pellorneidae.
Loài này tách ra từ Robsonius rabori theo nghiên cứu năm 2006 của Collar.
